Fix empty Anthropic SSE data frames - #680
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Motivation
GitHub Copilot can emit empty SSE
data:frames on the Anthropic Messages API path. Tau currently turns those frames into an empty string and passes them to the JSON decoder, which surfacesProvider returned invalid JSON chunk.Partially addresses #679.
Changes
data:payloads intau_ai.anthropic._parse_sse_linehttpx.MockTransportthat keeps streaming successfully across an emptydata:frameThis keeps the change limited to the provider streaming layer, consistent with Tau's architecture.
The separate empty
tool_use.nameerror reported in #679 is not addressed by this patch.